Top similar games like Sentry System:

Idol Keeper is a 3D one-player turn based game where you have to make many strategic choices as you face demon waves, with many random events guarantying hours and hours of unique gaming time.

A real-time tug-of-war roguelike deck builder. Your buildings spawn your army. Your cards, blueprints, and imbues decide what that army becomes. Place buildings in your yard, work the belt, and push two lanes until one stronghold falls.

A roguelike tower defense where every draft permanently mutates your build. Stack modifiers, trigger massive Surge events, and watch your defenses evolve into unstable, compounding systems that fight in ways you didn’t design.

Galactic Garrison is a sci-fi, turn-based tower defense game where you defend your base from relentless alien waves on Mars. Deploy soldiers, build barricades, and upgrade defenses to withstand attacks. Earn powerful reward cards to gain strategic advantages and outmaneuver your enemies.

Tiny Battles is a tactical action auto-battler where battles take place automatically in the arena. Prologue is a demo version of the Tiny Battles game, where 2 of the 5 factions and 3 of the 15 enemy opponents are available to play.

A roguelike auto-battler defense where luck meets strategy. Spin a 3x3 slot machine to summon units and grow your army by absorbing others. Use Items and Cores to manipulate the odds and survive challenging judgement waves and boss waves. Every spin and every choice counts.

Turn your armada into a rotating fortress, striking from every angle. A roguelite tower defense where spatial reads decide survival.

A real-time line-battle roguelite. Spend rations to summon swordsmen, shields, archers and cavalry onto a single front, then break the enemy base. Pick relics and promotions at every fork to build a different army each run. Three commanders, three ultimates.

Red Sea is an intense Real-time Tactics game where you control a small team of vigilantes in increasingly challenging battles. It features a Scriptable Tactics system that mixes auto-battling with manual overrides and has a ton of powerful ability interactions to discover.

TD Worlds is a dynamic, highly strategical game that challenges your skill. Build an impenetrable defense and get ready to plunge into a new, unknown world to uncover its secrets. Use Twitch integration and play with your viewers.

Tau Cubis is a mazing tower defense game set in colorful sci-fi landscapes. Use your strategic skills to overcome numerous challenges and advance through the leaderboards.

The Black Siege is a roguelite bullet heaven base defense game where you command the last army on Earth. Defend your headquarters from the plague zombies, hire engineers, and repair humanity’s last rocketship before the siege breaks through.

Temporal Titans is a Tower-Defense game with Time Travel. Send mechs back to previous waves to prevent your defeat, and protect your salvage team from the monstrous Grell as you scavenge the ruins of a lost earth. Rewind, rethink, and reclaim the future!

SEND YOUR CREATURES! Build an army of upgradable creatures, hold the increasing amount of lanes and destroy the enemy Portal before you're overrun!

Obsolete is a roguelike RTS where units act autonomously allowing you to plan and react without micromanagement. Customize your loadout, exploit synergies and establish your own strategy.

Defend your moon from endless alien waves! Collect gold, upgrade defenses, unlock new weapons and planets, and build the perfect defense while you do other things.

You are the guardian of a cursed labyrinth and must prevent an adventurer from escaping with the help of your monsters. But the adventurer keeps trying again and again, accumulating levels and getting stronger... Survive to the highest possible level !

The hungry Gooper swarm threatens intergalactic peace. Stop them! Build towers around planets and take control over their orbits. Spin them with all you’ve attached! Collect new towers, powers and upgrades to beat the onslaught of goopers and save the galaxy in this colorful Tower Defense Roguelite!

You wake up in a gloomy room. Become the test subject of a shady software program that feeds on Tower Defense - Roguelike - Deckbuilder simulations.

Co-op and Single player Tower Defense genre.

Pirate Rush is an auto-battler strategy game. Choose your crew, strengthen them, dominate the battlefield with your tactics, and clear your homeland of invaders.

Upgrade your engine’s arsenal in this bullet hell, tower defense roguelite featuring the most heavily armored locomotive in existence. Engineer and command the Ironfront Express in a unique take on lane defense where you upgrade with specialized turrets, drones, and tactical abilities.

BALLRENA is a physics-driven build-crafting auto-battler roguelite. Choose a Core, buy, rotate, and merge oddly shaped parts, then fit them into a tight 5×5 grid. Send your custom ball into the arena and watch every collision, weapon trigger, and chain reaction put your decisions to the test.

Axon TD lets you expand the map boundaries themselves. A huge arsenal of towers and a wide variety of enemies clash in a battlefield that grows to your whims. Engage in single, cooperative, and roguelite gameplay.

A medieval Tower Defense x Autobattler Roguelite. Defend your Keep across escalating waves, recruit different unit types, and cast spells from different Schools of Magic. Spend what you earn on a skill tree with over 300 upgrades, and place them on a Decree Bar with many unique modifiers and mults.

Astro Industry Wars is a lighthearted take on the RTS genre featuring distinct unit types, base building, economic production chains, and customizable unit rosters.

Button Pop is a 3D Tower defense game fused with Button mashing chaos. Construct the deadliest defense strategies by unlocking powerful traps and turrets across a variety of terrains, while building your very own button with the rewards of your adventures!

A minimalist sci-fi tower defense. Buy soldiers and upgrade them, defeat waves of enemies, hold your lines.

Undead army fills the world, and we are trapped in the cave of an ancient god. Roguelike strategic defense! Use your resources wisely, lead your soldiers, and unite the survivors. Ultimately, turn your cave into a fortress capable of defeating the undead king. The fate of the world is in your hands.

Grow like a roguelike, draft your party like an auto-battler, command like an RTS — a semi-auto-battler roguelike of a hundred battles.

A game for those who played hundreds of strategy/roguelikes and want something new and wild. Build your army, explore a harsh random world, fight varied battles, die, start over, experiment, break the game, become godly and destroy everything. Be proud.

Bannerfall is a cute-looking but deeply tactical single-player roguelike RTS. Build custom squads of units, equip them with empowering banners and face sieges, skirmishes and story events as you journey through a randomly generated world each run.

Engineered to Purpose is a new tower defence game where you custom-design towers to defend your base, with millions of builds to explore and refine. Set in the far future, E2P's story of posthumanism, family, and change will open new worlds to explore and survive.

Defend the evacuation of Terra on the losing side of an alien invasion. This experimental action strategy game breaks out of genre norms to provide fresh mechanics to strategic gaming.

Gear up and get going! Defend your outposts from waves of alien enemies with your mech. Build and upgrade your base, protecting the extraction of the mysterious planetary system’s rich resources!

A fast-paced, time-focused twist on tower defense with a strong emphasis on story, gameplay progression, and world-building.